Meter for elastic fluids.



A. R. DODGE.

METER FOR ELASTIC FLUIDS.

APPLICATION FILED MAB..17,1908.

Patented Feb. 24, 1 9 l 4.

3 SHEETS-SHEET 1.

/n ve nt'or' Austin 1700 e.

Attv

Witpesqes:

A. R. DODGE.

METER FOR ELASTIC FLUIDS.

APPLICATION FILED MAR,17,1908.

Patented F61). 24, 1914.

a SHEETS-SHEET 2.

m0, mm P J16 L 1 w A Witnesses A. R. DODGE.

METER FOR ELASTIC FLUIDS. APPLICATION FILED MAR..17,190B.

1,087,930. Patented Feb. 24, 1914.

3 SHEETB-BHEET 3.

0 UMMZ Q UNITED STATES PATENT OFFICE.

AUSTIN R. DODGE, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

METER FOR ELASTIC FLUIDS.

Specification of Letters Patent.

Patented Feb. 24, 1914..

Application filed March 17, 1908. Serial No. 421,696.

7 '0 all whom it may concern:

Be it known that I, AUSTIN R. Donor a citizen of the United States,residing at Schenectady, county of Schenectady, State of New York, haveinvented certain new and useful Improvements in Meters for ElasticFluids, of which the following is a specification.

The present invention relates to meters for measuring the rate of flowof steam or other elastic fluid in a main or conduit. The invention hasfor its object to provide a meter which will accurately indicate orrecord the amount of elastic fluid flowing through a main.

The invention is more especially adapted for recording the flow of steamfrom a source of supply to a turbine or reciprocating engine and will bedescribed with that in view, but it is to be understood that theinvention is not to be construed as limited thereto unless specificallystated in the claims, since it is of wider application.

My invention is based on the theory that as the quantity of elasticfluid flowing per unit of time through a conduit or main changes itsvelocity changes. I utilize this change in velocity to create a desiredpressure difference which difference is weighed by suitable mechanism,the position of some part of said mechanism at any instant giving. bycomparison with a suitably formed scale, an indication of the rat f fl wof fluid flowing in the main. By, using a marker and a moving chart apermanent record is made of these indications.

In carrying out my invention a pivoted member or scale beam is mountedon a suitable frame and supported by knife edges to reduce friction.Mounted on and moving with the beam is a hollow member, receptacle orcontainer comprising, for example, two connected vessels or cups havingsuitably shaped walls, which cups preferably contain mercury but whichmay contain other fluid heavier than that being metered. The cups are ormay be disposed at equal distances from and on opposite sides of thebalancing point or pivot of said beam. The beam is tilted automaticallyby varying the weight of th. contents of said hollow memher in responseto changes in rate of flow' of fluid in the main being metered; i. 6.,by

causing mercury t0 flow from one cup to the other, the amount of mercurytransferred and the direction of flow being a function of the varia ionsin steam pressure due to changes in velocity of the steam or other fluidto be metered. Located in the main conduit or conductor pipe carryingthe steam or other fluid to be measured is an agent, that, in responseto changes in velocity of said fluid, causes a difference in pressure.This differential pressure is communicated to the mercury cups by smallpipes, that of higher pressure communicating with one cup and that oflower pressure with the other.

As the velocity of the steam in the main conduit may vary indifl'erentparts of its cross-section it is important to have an agentwhose action will be responsive to the mean velocity of the steamflowing in different parts of the conduit rather than to that of anyparticular part. This can be accomplished in a variety of ways. I attainthe desired result by the use of a plug or device which extends from oneside of the conduit well in toward its %enter, or it. may extend beyondthe center well toward the farther side. In this plug are two sets offunnels or openings, one set, viz. the high pressure, facing against thedirection of flow and the other, viz. the low pressure, facing in thedirection of flow. All the funnels of a given set are connected inmultiple to the same passage, pipe or conduit, and the two sets areconnected by passages, pipes or conduits with the mercury cups mountedon the pivoted beam.

If steam under high pressure is to be conveyed from a main to a movingelement of a meter in such manner as not to interfere with its freedomof movement special means must be provided for the purpose. To carry outthisvery important feature of my inventiontwo coils are provided, oneconnecting one set of funnels with one mercury cup and the otherconnecting the second set of funnels withthesecond cup. These coils aremade by winding up a very thin walled tube after the fashion of ahelical spring and subsequently flattening the turns in planessubstantially perpendicular to the axis of the coil to eliminate theeffect of pressure therein. This results in an exceedingly flexiblecoil, and the pressure therein, which may be as high as 200 poundsswmmmammw... i

per square inch, will have no tendency to force the turns apart whichwould interfere with the accuracy of the indications.

Since the beam is pivotally supported in a horizontal position and isactuated by the cup containing the most mercury it follows that unlessmeans are provided to prevent it the beam would tilt at one end in onedirection or the other and stay in that position no matter how great thechange in the rate of flow of fluid in the main might be so long as saidchange continued to be of the same character, z. e., an increase in flowon one hand or a decrease in flow on the other. Sucha deflection of thebeam could of itself give 'no useful indication. In order to utilize thetiltin of the beam to directly indicate the rate 0 flow, I mount aweight on the beam and cause it to move automatically forward orbackward thereon as the rate of flow changes. To this weight is affixeda device such as a pointer which by its position with reference to asuitable scale may directly indicate the rate of flow, or it may make arecord on a chart which is driven by clock-work or other means at anypredetermined rate-of speed. Inasmuch as the position of the beam issensitive to changes in the rate of flow of the fluid, I utilize thebeam in the present illustration to control a motor which moves theweight toward the outer end of the beam as the rate of flow of the steamin the main decreases, and away from it as the rate of flow increases.This control may be accomplished in any well known manner. When the beamis balanced (in the present illustration of my invention horizontal) themotor is out of operation,-when tilted downward at one end the motordrives the weight inward toward the pivots, and when tilted u ward atsaid end the motor drives the wei t in the opposite direction. In otherwor s the motor adjusts the weight on the beam until it balances theforce exerted thereon by the difierence in steam pressure due to thefunnels. In this particular the meter somewhat resembles the well-knownplatform scale wherein the thing to be weighed is mounted on. t eplatform and the weight is slid by hand along the beam until it balancesthe thing being weighed when the free end of the beam w1ll be balancedbetween the upper and lower stops. I may use motors of various kinds forthis purpose but prefer an electric motor on account of its simplicity,small size and the ease with which it can be started in either directionand stop d. Also because it can be mounted direct l on the beam andpreferably but not necessarily on'the side away from the pivots and theconnections leading thereto made so flexibleas not to interfere with thefreedom of movement of the beam. The necessary tilting movement of thebeam to start or stop the motor is small, the amount depending upon thedistance the contacts are from the axis of movement. I have found that amovement of one one-hundredth of an inch each side of the central orneutral position and is sufiicient, but in some cases it ma be made moreor less.

As the fliiid flowing from the source of supply is subject to variationsin pressure, I provide a means for compensating therefor. As. anillustration of this feature of my invention, a device sensitive topressure is provided that modifies the effective action of the weight onthe beam. Ihave elected to show a divided weight on the beam the partsof which normally maintain a fixed position with respect to each other,but when the pressure increases above a certain point one part is movedtoward the other part and when the pressure decreases below said pointis moved away from it. The parts of the weight are suitably connected asby a screwthreaded rod, and the nut that regulates the position of theparts one to the other is turned in one direction or the other by adevice such as a cone or suitably shaped member carried by the beam andturned by a device sensitive to pressure changes. It is important tosupport the pressure compensating means as well as the weight actuatingmechanism on the same knife edge pivots so as to eliminate errors of allkinds which would result from independent supports.

Since the changes in superheat are relatively small or take placeslowly, and since their effect on the total rate of steam flow is small,they can be compensated for by handactuated means, such for exampleas'changing the position of the pen or marker with respect to the mainweight.

In the accompanying drawings, which illustrate one of the embodiments ofmy invention, Figure 1 is'a View in side elevation of my improved meter;Fig. 2 is an end view of the same; Fig. 3 is a detail view of thescale-beam and some of its attached parts; Fig. 4 is a view in sideelevation of the clock mechanism and the roll of paper driven therebyupon which a record is to be made; Fig. 5 is a detail view of the agentor device by means of which changes in the rate of fluid flow in thesteam mains are communicated to the meter proper; Fig. 6 is an edge viewof the-said agent or device showing its location in the s inn-carryingconduit; Fig. 7 is a cross section of the same; Fig. 8 is across-sectional detail view of one of the reservoirs interposed betweenthe device responsive to the rate of flow and a mercury-containing cupcarried by the beam; Fig. 9 is a diagram of the circuit connections ofthe motor; Fig. 10 is a detail view of a slight modification; Fig. 11 isa detail view showin an arrangement of piping for connectingt e meter toa main;

Fig. 12 is a detail view sh wing asomewhat diflerent arrangement of thereservoirs, and Fig. 13 is a detail view showing a suitable scale orchart for recording the indications of the meter. 7

1 indicates a base, and supported thereon is a frame of suitable shapehaving seats 2 on opposite legs to support the knife-edges 3 attached tothe movable element. The movable element comprises a horizontallydisposed beam 4 having a finished upper surface to receive the rollerson the weight 5, called the main weight, and permit it to travel to andfro freely subject to the control of the motor 6. Fastened to theiet'thand end of the beam is the electric motor 6 comprising the usualstationary field-magnet and rotating armature. Located below the beamand carried in suitable bearings is a lead-screw 7 that is threaded tothe main weight 5. The armature shaft is connected to the screw throughspeed-reducing gearing 8. The main weight is supported from the beam byrollers and is threaded to the screw. The beam itself is provided with adepending frame 9 that is provided with and supported by the knife-edges3.

Below the frame 9 and carried thereby are two mercury-containers or cups10 and 11 that are connected on their under side by a conduit 12 thatmay contain a valve 13. The valve 13, when used, is closed in startingthe meter to prevent the fluid under pressure from driving the mercuryout of the cups. After pressure is admitted to both cups the valve isopened and the meter is readyfor use.

As will hereinafter appear more fully some of the parts are subjected toa pressure higher than the others. ience the principal parts subjectedto the higher pressure are marked with the letters H. P. and thosesubjected to the lower pres- .sure with the letters L. P. The cup 10being on the high pressure side will be.called the high pressure cup andthe cup 11 being on the low pressure side will be called the lowpressure cup. .It is through the eonduit 12 that the mercury flows fromone cup to the other when'there is a change in the rate of flow of thefluid in the supply conduit. These cups are preferably but notnecessarily situated at equal distances from the knife-edge pivots ofthe beam so as to balance each other. A change in level of the mercury14 in the cups causes the beam to tilt in one direction or the otherabove its fulcrum. On top of the mercury in each cup is a body of water15 due to the condensation of the steam. The cups are supported from thedepending frame of the beam by the pipes 16 and 17 which also carryfluid. These pipes are fastened into blocks 18 and 19 secured totheframe on opposite sides, which blocks are directly in For convenlinewith and under the knife-edge pivots, and in the same vertical plane.

Depending from the main fraine are flexible connectors 20 and 21 whichconvey fluid, water in this case, under pressure to themercury-containing cups. Each is composed of a number of turns offlattened tube wound after the fashion of a helical spring. The turns ofthe coils are flattened after the coil is wound and in planessubstantially perpendicular to their axes so that they will beexceedingly flexible and the pressure of the fluid within them will haveno tendency to force the turns apart. The axis of each coil is verticaland as near as possible in the plane of the pivots so that theresistance to tilting of the beam is reduced to a minimum. The connector20 is connected to the water-containing reservoir 22 at its upper endand at the lower end to the block 18 and the mercury vcup 10. Theconnector 21 is cgnnected to the watercontaining reservior 23at itsupper end and to the block 19 and mercu'rygup 11 at its lower end.

The reservoirs contain a fairly large amount of water, their cubicalcontents being greater than those of the cups, so that when mercury isdisplaced from a cup the latter will be quickly filled with Water. Inthis manner the column of water above each body of mercury is maintainedpractically constant. The means employed to dispose of surplus waterwill be described later.

In the supply conduit 24:, Figs. 5 to 7, is an agent sensitive tochanges in the rate of flow of the elastic fluid. It comprises a support25 which is screw-threaded into the conduit so that it can readily beremoved or inserted. When removed the opening can be closed by athreaded plug in the usual way. Integral with the support is arectangular part 26 containing a plurality of conicalshaped funnels,arranged in sets 27 and 28. Those offset 27 have their large ends facingaway from the direction in which the fluid is moving. At a point midwaytheir length these low pressure conical. funnels are connected to thepassage 29, and the latter is connected by the pipe 30 with thereservoir 23 and low pressure mercury cup 11. The set of funnels 28 donot extend through the part 26 as do the funnels 27, and are reverselyarranged, that is to say, they are conical in shape with the large endsfacing the direction from which the flowing fluid is received. Thesehigh pressure funnels are connected by the passage 31, shownin, dottedlines, and'the latter communicates with the pipe 32, the reservoir 22and the high pressure mercury cup 10. The fluid pressure within thepassage 31 is equal to the mean static pressure within the main [conduit24 plus the pressure due to'the velocity of flow and the density of theflowing IZQ fluid. The pressure in the passage 29 is lower than thestatic pressure by a certain amount, determined by the velocity anddensity of the flowing fluid.

I regard the arrangement of the funnels described as being of particularimportance. By their arrangement the power available for actuating themeter is ampl sufficient for all conditions, and the power eingcomparatively large and the resistance to movements of the parts small,the latter may be disregarded. Further, the construction shown requiresno special fitting in the main pipe line, thus obviating a large expensein installing. I do away with all stufling boxes which are liable togive trouble, and when associated with moving parts create objectionablefriction.

It is evident that the construction of the funnels is exceedingly cheapand durable. It has the further advantage that only one hole has to bemade in the steam main which can be bored and tapped without disturbingthe main in its position. The agent further has the advantage that itisresponsive to the mean velocity of the steam instead of to the velocityat any particular point in the main and hence the indications of themeter are more accurate. The arrangement gives a greater deflection ortransfer of mercury from one cup to another than where the velocity atone point only is considered. Both the leading funnels 28 and thetrailing funnels 27 receive steam in the same plane, therefore, thesteam is not diverted by the wall of one funnel before acting uponanother funnel. It is possible to locate the agent in a short length ofpipe and to obtain the same accurate results as if it were located in along straight pipe. Owing to the construction and nature of said agentit can be used for other forms of meter than the one shown and many orall of its advantages will follow therefrom.

In a meter of this character there is always a certain amount ofcondensation and the level of the mercury in thev cups changes somewhatwith changes in pressure due to the action of the funnels. In order toobviate the effects of a change in water level and to keep the space inthe cup above the mercury filled with water at all times, the reservoirs22 and 23 are provided. On the side of one or both reservoirs,preferably both, is a device for automatically discharging the excesswater as shown in Fig. 8. It comprises supports 35 and 36 which carry agage glass 37 between them, suitable packings 38 being provided toprevent the escape of fluid. The upper support communicates by thepassage 39 with the chamber in the reservoir and acts as a dam oroverflow to maintain a constant level. Extending vertically in the gageglass is a thermostatic rod 40 whicn is provided with a screw 41 at itsupper end for adjusting its vertical position and a valve 42 at itslower end adapted to engage a seat on the support 36. When the wateroverflows the dam and runs down into the gage glass it chills thethermostatic rod and causes the same to decrease in length and open thevalve and permit the excess water to escape by the pipe 43. On the otherhand when the water esca es and steam strikes the rod it expands ancloses the valve. This;

automatic opening and closing of the valvii" takes place at more or lessfrequent intfi vals so long as the meter is in operation. Owing to thefactthat the cubical contents of the reservoirs are comparatively largewith respect to those of the connectors and mercury cups, any change inlevel of the mercury due to pressure changes is immediately followed bya. change in the amount of water in the cups, and since the heights ofthe water columns on both sides of the pivots remain substantiallyconstant at all times, it does not affect the accuracy of registration.

The means for recording the variations in the rate of flow of the fluidwill now be described.

Mounted on the base is an upright frame member 44 which supports a clockmechanism 45 of any approved construction. It may be wound by anysuitable means. Mounted on a spindle 46 is a roll of paper 46 which maybe suitably ruled with horizontal lines to indicate time and verticallines to indicate the flow of steam in pounds per unit of time. See Fig.13. The paper runs over a drum 47 and is engaged by the needle, pen, ormarker 48 carried by the main weight 5. After going over the drum thepaper passes around an idler 49 and is wound on a drum 5O driven by oneof the gears of the clock. The marker which I employ comprises a smallglass receptacle containing ink and an L-shaped tube 51, one end ofwhich enters the body of ink while the other rests on the paper or chartdriven.

by the clock-work. The marker is attached to the lower end of a link 52,the upper end being pivoted to the arm 53 carried by the main weight 5.The marker should be .free to adjust itself on the chart as the positionof the main weight changes.

The means for controlling the electric motor will now be described.

Mounted on some part of the moving element of the meter is an arm orequivalent device 55 that tilts with the beam about the knife edgepivots. On the arm is a contact 56 forming a part of the motorcontroller. To a. fixed support are secured adjustable contacts 57 and58 forming the remainder of the controller. The contactsare carried byadjusting screws and for the purpose of illustration the clearancebetween them and the moving contact 56 has been exaggerated.

Referring to Fig. 9, 59 and 60 indicate the mains of any suitable sourceof current supply. 61 indicates the armature of the series motor, and62- its field magnet Winding In series with the armature is a resistance63 to reduce the flow of current therein. The circuit of the motor iscontrolled by a.solenoid relaymagnet comprisinga core 64 and a winding65. One end of the windingiis connected to contact 58 and to the main 60through the switch 66 that is normally closed and is opened when it isdesired to cut the apparatus out of circuit.- The other end of thewinding is connected to the stationary contact 57 and the main 59. At apoint midway the ends the coil is connected to the movable contact arm55. Situatedat the right-hand endof the core is a bar 67 that carriescontacts which coiiperate with the fixed contacts 68 and 69 to cause themotor The action of-this part of the meter is'as follows: Assumingthat achange in flow of the steam in themain 24 causes enough mercury to enterthe low pressure cup 11 to depress the beamfi, arm 55 and contact 56,the currentwill pass as follows: Startingfrom the main 6O itflowsthrough theswitch 66 to the contact 58 thereby shuntingthe left handportion of the windingv of the sole noid magnet, thence through contact56, arm

55 to the central ta of the winding 65, thence throughthe right handpart of the coil and resistance 73 to the main 59. This causes the core64 to be moved bodily to the right closing the circuits of motorcontacts 68 and 69. The circuit through the motor will then be asfollows: from the main 60 through the resistance 63 and armature 61;

contact 69, to and through the field Winding. 62 to contact 71, thenceto contacti68, and This will cause thearmaturethe main 59. to revolve ina direction to move the main weight 5 toward the pivotandaway from thefree end of the beam until the latter is balanced and the contact 56breaks the relay circuit when the motor stops.

Assuming that the fluid pressure on the high pressure cup 10 decreasesand the mercury in the low pressure cup is. at a higher level, mercurywill flow from the latter to the former thus tilting the free end of theing the contact 57, current will pass through.

the parts as follows: Starting-from min 60 it flows through the switch66- to and 61 in..the.same directionv as before thence through thecontact 71 .to and throughxthe field winding62 .in the oppositedirection to that previously described,- which reverses thedi'rectionvof rotation of thearmature,

thence through'the contact 7 2 tothe main59.

This wil'l'cause the armature to revolve ina directionto move the mainweight 5 toward the free end of the beam and away from the pivots. Thisaction continues until the weight is moved to a position to balance theeffect of'uthe mercury cups whenthe relay circuit \willi .beopened atthe contact 56 and the motor .will stop. This action is repeatedeachntime a change in flow in the main 24 takes place, and themarker-carried by the main...weight makes a permanent record ofthe;same.on. the chart. As the flow in the main increasesthe main weightmoves from right to left, and in the reverse direction as the flowdecreases. This means then that the zero is. on 'the righthand .side ofthe chart and higher values on the left. I have shown 'themairr weighton the right hand side of the; knife edge pivots but it is notnecessarily limited to this position. a

In orderto stop. the motor armature suddenly, when the supplvcircuit isinterrupted, abrake is provided comprising a resistance 74 connected. inshunt to the armature. When the main circuit is interrupted the armaturehas a tendencyto revolve due to its inertia, the action being similar tothat ofa generator running on a short circuit. This stops the armatureinstantly or practical'ly. so, and prevents overtravelwhich wouldlie-detrimental -to the accuracy of the meter.

Lhaveshown'the motor 6 mounted on the beam hat one side of the knifeedgepivots andthemain Weight 5 on the other. Under such; conditions the massof the weight must be sufiic'ient. to balance the weight of the motor aswell as to balance the'pressures on the mercurfy cups. I may provide aseparate weight 75 or balancing the motor if desired as shownin Fig. 10which may be adjusted on the-frame-Q or othersuitable part. \Vhen thisis done the-centerof gravity of .the main weight would be. directlyabove the center line of the knife edges when the flow is zero.

'Themeteras described thus far is capable ofefi'ecti-vely recording theflow of steam in a main- -and..I have usedthe same for this purpose.-Where the pressure ofsteam in weight as a unit.

the main changes for any reason it is desirable to provide means forcompensating for such changes. As an illustration of this feature of myinvention, I have shown one means, device or mechanism, but it is to beunderstood that the invention is not specifically mited thereto unlessso stated in the claims. This means, device or mechanism comprises aweight 76, which, to distinguish it from the other part or main weight,may be termed an auxiliary or compensating weight. It is arranged tomove back and forth on the beam 4, rollers 77 being provided to reducefriction. This weight is separated from the main weight by a distancemore or less eat, and so lon as the steam pressure in t e main 24remains constant it will and should move with the main When the pressurechanges, the flow remaining the same, it is necessary for the auxiliarvweight to move independentl of the main weight. The movement 0 the partsof the weight with respect to each other may take place while the motor6 is moving the main weight or independently thereof. Connecting the twoweig ts is a screw 78 that enters a nut 79 carried by an arm dependingfrom the auxiliaryweight. This nut is held against endwise movement withrespect to weight 76 but is free to revolve. Situated below the nut andin engagement therewith is a cone or other suitable power transmittingmeans 80 that is mounted on a spindle 81 carried by suitable bearings onthe frame-9. On the spindle is a pinion 82 meshing with a segmental gearpivotally supported on an arm 83. The lower end of the arm is connectedby ,a link to the upper end of a pressure-responsive device 84. Asshown, this device is constructed after the fashion of a Bourdon tubeand tends to straighten as the pressure on one side of the apparatusincreases, in this case the high-pressure side. In other words, it isconnected to the fluid conduit in the block 18, and the latter isconnected to the funnel openings 28 and the high-pressure mercury cup10. As the pressure increases, assuming the flow to be constant, thesegmental gear moves clockwise and the cone counter-clockwise. Thisinturn rotates the nut reference numeral 79 on the screw 78 in a manner tomove the auxiliary weight toward the main weight, it being noted thatthe position of the latter is determined by the lead screw 7 and themotor 6. A decrease in pressure moves the auxiliary weight away from themain weight. When the rate of flow in the main is high, the auxiliaryweight has to be moved toward or away from the main weight by a greateramount to compensate than when the rate of flow is low. In other words,the pressure correction has to be greater for a large than for a smallsteam flow. The Bourdon tube illustrated is so designed that it has aconstant length of movement at its outer end for each unit change ofpressure, but the invention is not limited to this particular.

It will be noted that the pressure-correction device, means or mechanismis carried by the same pivots which support the remainder of the movingparts of the apparatus, and where their distribution is such that theytend to create an unbalanced arrangement of parts, suitable compensationmust be made, as for example, by adding to the mass of the main wei ht 5mto that of weight 75, Fig. 10, or by changing the position of thelatter so that it will exert a greater or lesser effect.

In Fig. 11 is shown a suitable arrangement of piping and valves forconnecting the meter to the agent in the main. 24 indicates the mainthrough which the fluid to be metered flows, and 25 the screw threadedplugI or support. The pipe 30 is connected to to low pressure mercurycup at one end and to the agent at th other. The pipe 32 is connected tothe high pressure mercury cup at one end and to the agent at the other.In the former pipe is a shut-off valve 85 and in the latter a shut-ofi'valve 86. Connecting pipes 30 and 32 is a cross-pipe 87 containing ashut-off valve 88. Assuming that all these valves are closed and it isdesired to start the meter, the valve 88 is opened and then valve 85 or86. This means that pressure is simultaneously admitted to both mercurycups. Subsequently either valve 85 or 86 is opened, depending upon whichone was opened first, and the valve 88 is closed and the meter is readyfor operation. This arrangement also has the advantage of permitting theoperator to check the zero read ing of the instrument by comparing theposition of the weight and indicator with the zero line on the chartfirst by opening one pipe to its mercury cup and noting the position ofthe parts, then closing the pipe and opening the other and noting theposition of the parts. The arrangement is such that there is no dangerof the mercury being driven out of the cups during this test or instarting the meter. It also enables me to do away with the valve 13 inthe connection between cups thereby simplifying the apparatus to thisextent.

The meter described can be used for measuring a fluid wherein the flowis continuous as is the case where steam is supplied to a turbine, or itmay be used for metering the steam supplied to a reciprocating engine orv a turbine where the flow is more or less pul satory in character.Where the meter is used for the latter purpose it is preferable tolocate the reservoirs 22 and 23, Fig. 12, as

close to the agent in the main as possible to avoid the introductioninto the system beyond the agent of any substantial amount of elasticfluid which would introduce an error in the reading of the meter. Thiserror is caused by the fact that said elastic fluid is compressed to agreater or less extent each time the velocity of the column of fluid inthe main changes due to pulsations. It will be noted that the pipes30-32 are very short and that the level of the water in the reservoirsis above the lower end of the said agent. Each reservoir is providedwith a gage glass 37 so that the amount of water therein canbeseen ataglance. The thermostatic valve in this case may be located Within thereservoir, the adjusting screw 41 being outside as before.

In a meter of this character it is important that the parts shall be soarranged that all air traps or pockets are avoided since they willintroduce a considerable error into the readings. To avoid such airtraps or pockets I arrange the parts receiving fluid in a verticalposition so that any air which may enter is free to rise and escape. Asthe steam condenses beyond the agent the water runs downward into thereservoirs. pipes, flexible connectors, mercury cups, etc., and expelsthe air.

By using an agent of the character described to produce a pressuredifference, I obtain a material saving in installing over those meterswhich require the use of a device inserted in the main steam pipe andcontaining a Venturi throat. \Vhere such a device is provided, forexample in a twelve inch steam main, the cost of making the device,cutting the main, flanging, installing it, etc, would roughly amount toabout two hundred dollars. Further it requires shutting down someportion of the plant for a considerable length of time, a thing whichstation managers are exceedingly loath to do. Again the permanentintroduction of such a device into a'main results in a loss of powerthat is objectionable. Yith my im- PIOXQ (l meter the main is notdisturbed in its position. It is only necessary to drill an :1 tap a oneinch hole. I have installed one of my improved agents in such a main andconnected it to a meter in less than two hours time, .and this withoutshutting down the installation beyond cutting off the steam supply tothe particular main being worked 011, Further I can drill and tap eachof the mains leadingto the turbines or other enginesat a small expenseand fit them with agents, and one meter can be employed and moved fromplace to place as desired. Instead of having the agents in the mainsthey can be removed and threaded plugs substituted. The saving in suchan arrangement over .the Venturi construction is obvious.

Inaccoi'dance with the provisions of the patent statute's, I havedescribed the principle of operation of my invention, together with theapparatus which I now consider to represent the best embodiment thereof;but I desire to have it understood that the apparatus shown is onlyillustrative, and that the inventionccan be carried out by other means.

What I claim as new, and desire to' secure by Letters Patent of theUnited States, is,

1. In a fluid meter, the combination of an agent which causes a pressurediflerenc'e whose value is determined by the rate of flow of the fluidbeing metered, a movable member, a means responsive to changes in theValue of said pressure difference for moving said member, a means forbalancing the member, a device for moving the balancing means withrespect to the member, means by which the device is controlled by themember, and an indicator whose positionis determined by the balancingmeans.

In a fluid meter, the combination of an agent acted upon by the fluidpassing through a main to cause a pressure difference, a pivo-tallysupported member,ameans for moving the member which is responsive to thepressure difference due to said agent, a weight opposing movements ofthe member, and adevice for changing the effective action of the weighton said member.

3. In a fluid meter, the combination of an agent acted upon by the fluidpassing through a main to cause a pressure difference, a pivotallysupported member, a means for moving the member which is responsive tothe pressure diflerencedue to the agent, a weight opposing movements ofthe member, a means for varying the etlective action of the weight onsaid member in opposition to the effect of said means, and a movableindicating .device whose position is determined by the joint action ofthe pressure responsive means and the weight.

4. In a fluid meter, the combination of an agent acted upon by the fluidpassing through a main to cause a pressure difference, a. pivotallysupported member, ameans for moving the member which is responsive tothe pressure differencevdue to the agent, a weight which opposesmovements of said member, a means for moving the weight into differentpositions to change its effective action, and an indicating device whoseposition is determined by the joint action of the pressure responsivemeans and themoving Weight. Y i

5. In a fluid meter, the combination of an agent responsive to han esinthe rate of flow of a fluid to cause a pressure flifl'erence, amovable member, a means causing the member to change itspositionresponsive to the pressure differences due to the agent, a meansacting on the me her, an electric motor for actuating 'the' estnamed-means, a controller for the mottfir, and anindicator whoseposition is determined by that of the last named means.

(3. In a fluid meter, the combination of an agent that is acted upon bythe fluid to be metered to cause a pressure difference, a pivotedmember, a fluid container solely supported by said member for actuatingit, the fluid in the container being free to be displaced subject to theaction of the agent, conduit means conveying fluid pressure from theagent to the container, an adjustable means for weighing the displacedfluid, and an ipdicating device moved by said weighmgmeans.

7. In a fluid meter, the combination of an agent that is acted upon bythe fluid to be metered, a pivoted member, a fluid container mounted formovement about the pivot of the member and moving with the member foractuating it, the fluid in which is free to be displaced subject to theaction of the agent, conduit means conveying fluid pressure from theagent to the container, 8. means movable on the Inember for weighing thedisplaced fluid, a motor for moving the means, and an indicating devicemovable with said weighing means.

8. In a fluid meter, the combination of an agent responsive to changesin the rate of flow of a fluid to cause a pressure difieronce, a movablemember, a means connected with theagent and responsive to 'pressurechanges for moving the member, means including yielding conduits forconveying fluid under pressure from the agent to the means, a deviceacting on the member to oppose movements thereof, a means for shiftingthe position of said device, and an indicater whose osition isdetermined by the joint action 0 the pressure responsive means and thedevice.

f). In a fluid meter, the combination of an agent responsive to changesin the rate of flow of a fluid for creating a pressure difference, apivotally supported member, a pressure-responsive means carried by themember for moving it, means including flexible conduits for conveyingfluid under pressure from the agent to the means, a

traveling weight mounted on the member to balance the efl'ect of themeans thereon, a motor for shifting the position of the weight, acontroller for the motor, and an indicating device movable with theweight.

10. In a fluid meter, the combination of an agent responsive to changesin the rate of flow of a fluid for causing a ressure difference, apivotally supported cam. a means responsive to pressure changes andmounted on the beam for tilting it in one direction or the other, meansincluding elastic conduits for conveying fluid under pressure from theagent to the means, a. weight mounted to move along the beam to restoreits balance, a motor carried by the beam, for moving the weight, acontroller for the motor one part of which moves with the beam, and anindicator moved by the weight.

11. In a fluid meter, the combination of an agent that is acted upon bythe fluid to be metered to cause a pressure difference, a pivotallysupported beam, means responsive to a change in the conditions of thefluid being metered and which is movable withthe beam, means includinhelically wound conduits for conveying fiIlld from the agent to themeans, a motor moving with the beam, a weight mounted on the beam forbalancing the action of the means, a means actuated by the motor formoving the weight, a controller for the motor whose action is controlledby the movement of the beam, and an indicating device moving with theweight.

12. In a fluid meter, the combination of 'an agent that is acted upon bythe fluid to be metered to cause a pressure difference, a beam,knife-edge pivots for the beam, a frame attached to and moving with thebeam, means responsive to pressure changes carried by the frame, meansincluding yielding connections carrying fluid under pressure from theagent to the means, an electric motor moving with the beam, 'a leadscrew driven by the motor, a weight threaded on the screw and movable onthe beam, a contact device moving with the beam for controlling themotor, stationary contacts cooperating with the movable contact, asource of current supply for the motor communicating with certain of,the contacts, and an indicating device moving with the weight.

13. In a fluid meter, the combination of an agent that is acted upon bythe fluid to be metered for causing a pressure difl'erence, t

a pivoted member, an element subjected to the fluid pressure difl'erencedue to the agent for moving the member about its axis, means includinghelically wound flattened tubes for conveying fluid from the agent tothe element, the axes of the helices being in line with the plane of thepivot of the member, and an adjustable means cooperating with the memberto balance the effect of the agent thereon.

14. In a fluid meter, the combination of an agent that is acted upon bythe fluid to be metered to cause a pressure difference, a pivotedmember, a fluid container which by displacement of the fluid thereintilts the member in one direction or the other, a weight movable on themember to restore the balanced condition thereof after a displacement ofthe fluid takes place in. the container, means for moving the weight,means connecting the agent with the container, and an indicator whoseposition changes with that of the weight.

15. In a fluid meter, the combination of an agent that is acted upon bythe fluid to be metered to cause a pressure difference, a

pivoted member, connected =fluid containers which b in tilt t e mom orin one direction .orthe other, a weight movable on the member .torestore the balanced condition thereof after a chagige .in fluid leveltakes place thecontainers, a motor for moving the weight, a reservoirconnecte to eachmfithe containers for supplying fluid thereto, ameansconnecting the agent with each of the reservoirs, .and an indicatorwhose position changes with that of the weight.

16. In a fluid meter, the combination of an agent that is acted uponbythe fluid. to be metered to cause a pressure difference, a pivotedmember, connected fluid containers which by a change in level of thefluid therein tilt the member in one .direction orthe other, a weight torestore the-balanced condition of the member after a change in fluidlevel takes place in the containers,.means for moving the Weight on themember, a reservoir connected to each of the containers :for supplyingfluid thereto, a means connecting the agent with each of the reservoirs,an automatically acting device to maintain a constant level in one ofthe reservoirs, and an indicator whose position changes with that of theweight.

17. In a fluid meter, the, combination of an agent that is responsive tochanges in the rate of flow of the fluid being metered, a pivotallysupported member, connected mercury-containing cups mounted thereon, ameans including a flexible connection between each cup and the agent, areservoir in each connection containing liquid to supply liquid underpressure to :the cups to compensate for a change in level, a means forrestoring the equilibrium of the member after a portion of the mercuryhas been transferred from one cup to another, and an indicator whoseposition is determined by the joint action of the mercury-containingcups and the equilibrium restoring means.

18. In a fluid meter, the combination of an agent responsive to changesin the rate of flow of the fluid being metered, a tilting member, meansfor actuating the member comprising connected mercury containers whichare carried thereby, independent-connections extending from the agent tothe containers, reservoirs in the connections Whose cubical contentsexceed those of the containers, a movable Weight for balancing theeffect of the means on the member, and an indicator whose position isdetermined by the joint action of the means and the weight.

19. In a fluid meter, the combination of an agent acted upon by thefluid to be metered to cause a pressure difl'erence, a movable member, ameans causing the memher to change its position responsive to the a chane in-levelof thmfluidtherepressure vdifference .due .to theaagent, .anadv ustahle means .movable on. the member .fon

balancing. the. effect .of the agentthereon. anindicating devicecomprising a marker which changes .its position with that of. theadjustable 1 meansyand a. moving chart with which the-marker engages.

20.111 a..fluid' meteri-the combination of an agent ,acteduupon by, thefluid to be metered having a plurality of oppositely disposed tunnelsarranged in sets, whose action depends upon the mean velocity of thefluid bein metered, a movable member, and a means or moving the memberthat is acted upon =byx fiuid: .pressule from the .sets of dfunuels.

21. In asfluid meter, the combination of an agent located in the conduitcarrying the fluid .to be metered and which causes a pressuredifference, a pivoted member, a means for tiitin the member whoseaotiontis determinedi y that of the agent, a means :t'or balancing theeffect of' the agent on the member, a. donice sensitive to changes in acondition of .the fluid being metered for modifying :the action of themeans on said member attached to and moving with .the balancing means.

22. In a fluid meter, the combination of an agent that is acted. upon bythe fluid being metered to cause a pressure difl'erence, a movablemember, a means for movingthe member that is actuated by fluid pressuretransmitted to it from .the agent, a weight that is adjustably mountedon the member tobalancetheeflectsof fluid from the agent thereon, andadevice responsive to pressure changes-of the fluid. being metered formodilfging the actioniof the weight on the mem- 23. In a fluid meter,the combination of an agent that is acted upon by the fluid beingmetered to cause a pressure difference, a pivoted member, meansfort-iltin the member whose action is determined y that of the agent, adivided weight movable on the member to balance the eflect of the agentthereon, and a pressure-correction device acting .on one part oftheweight.

24. In a fluid meter, the combination of an agentthatis acted upon bythe fluid being'metered to cause a pressure diflerence, a pivotedmember, means for moving the member whose action is determined by apressure difi'erence duetothe agent, a weight which is ad'ustable on themember to balance the e ect of the agent thereon, and

apressure/correction device which progressivelv increases its efl'ect asthe pressure of the fluid being metered increases.

25. In a fluid meter, the combination of an agent that is acted uponbythe fluid being metered tocause a pressure difference, a pivotedmember, a means for moving the thereon, a pressure-correction device, aconnection between the correction device and one part of the weight formoving it, the movement of the connection progressively increasing inamplitude for each unit increase of pressure as the rate of flow of the.

fluid being metered increases, and an indicator which is movable withone portion of the weight.

26. In a fluid meter, the combination of an agent whose action isresponsive to changes in the rate of flow of the fluid being metered, apivoted member, a motor receiving fluid from the agent for moving themember on its pivot, a divided and adjustable weight carried by themember, an indicator movable with one portion ofthe weight only, aconnection between the parts of the weight, a pressure device whichautomatically moves the parts of the weight with respect to each otheras the pressure of the fluid being metered changes, a motor and a meansactuated by the motor for moving the divided weight as a unit on themember to balance the effects of the agent thereon.

27. In a fluid meter, the combination of an agent whose action isresponsive to changes in the rate of flow of the fluid being metered, apivoted member, a means for moving the member in response to the actionof the agent, a divided and adjustable weight carried by themember, anindicator movable with one portion of the weight only, a connectionbetween the parts of the weight, a pressure device, a conical meansmoved by the pressure device, a device moved by the conical means'toadjust one portion of the weight with respect to the other, a motor formoving the parts of the weight as a unit, and a controller for themotor.

28. In a fluid meter, the combination of an agent whose action isresponsive to changes in the rate of flow of the fluid being metered, apivoted member, means for moving the member in response to the action ofthe agent, a divided and adjustable weight carried by the 'member, anindicator movable with one portion of the weight only, a connectionbetween the parts of the weight, a means responsive to changes inressure of the fluid being metered, a conica device, gearing between themeans and the device, means for transmitting motion from the conicaldevice to one portion only of the weight, a motor, a connection betweenthe motor and the weight for movin the latter as a unit to balance theeffects o the agent on the meter, and 'a controller for the motor.

mg a member having orifices opening 1n one orifices opening in thedirection of flow of' the fluid, a passage connecting them, a second setof orifices opening in a different direction, and a passage connectingthe orifices of the second set, the said sets of orifices causing apressure difference.

31.'In a fluid meter, an agent that is responsive to changes in the rateof flow of the fluid being metered, which comprises a support, anelement carried thereby having sets of oppositely opening funnels,independent passages connecting the funnels of the different sets, thesaid sets of funnels causing a pressure difference, and conduitsconnected with the passages.

32. In a fluid meter, the combination of an agent acted upon by thefluid to be metered to cause a pressure difference, a pivotallysupported container containing a body of heavy liquid which is displacedin the container by said pressure difference, means connecting the agentand contalner, a means moved by the container, and means for equalizingthe pressures on opposite sides of the container to prevent thedifference in pressure created by the agent from forcing said body ofliquid out of the container.

33. In a fluid meter, the combination of an agent responsive tovariations in the rate of flow of the fluid being metered which causes apressure difference, a means actuated by said pressure difference, ameans for weighing the effect of said pressure difference on the means,a motor for adjusting the weighing means, a source of supply foractuating the motor, and a relay device regulating the supply of energyfrom the source to the motor, the said relay device being controlled bythe first mentioned means.

34. In a fluid meter, the combination of an agent sensitive tovariations in the rate of flow of the fluid being metered for creating apressure difference, a means acted upon by said pressure difference,means including reservoirs through which fluid pressure is transmittedfrom the agent to themeans, the reservoirs being so disposed that thelevelof the liquid therein approximates that of the liquid in the agentto prevent any considerable body of elastic fluid being trapped beyondthe agent, and an indicating device moved bythe means that is acted uponby the pressure difference.

no I

35. In a fluid meter, the combination of an agent acted. upon by thefluid being metered to cause a pressure difference, a means forbalancing the said pressure diflerence which includes a motor and adevice, means for communi ting motion from the motor to the device,brake for preventing overtravel of the motor, andan indicating deviceactuated by the device.

36. In a fluid meter, the combination of an agent which causes apressure difl'erence whose value is determined by the rate of flow ofElie fluid being metered, a movable member, means receiving fluidpressure from the agent for moving the member to difl'erent positionsdetermined by a change in the pressure difference caused by said agent,a movable weight which balances the force exerted by said means on themember, means for moving the weight a greater or less distancedetermined by the value of said pressure difference to cause it to varyits effective weighing action on the member and' an indicating devicewhose, position 1s determined by the joint action of the means and theweight.

37. In a fluid meter, the combination of an agent which causesa pressurediflerence' whose value is determined by the rate of flow of the fluidbeing metered, a movable.

member, means receiving fluid ressurefroni the agent for moving the memr to difl'erent positions determined by a change in the pressuredifference caused by said agent, a movable weight which balances theforce exerted by said means on the member, means for moving the weight agreater or less distance determined by the'value of said pres--- suredifference to cause it to vary its efl:'ec tive Weighing action on themember, a device responsive to a change in pressure of the fluid meterwhich modifies the action of the weight, and an indicating device whoseosition is determined by the joint action 0 the means and weight.

38. A means for creating a pressure difference comprising a base carriedby the main through which the fluid to be metered flowswith a means suported by the base which is provided with orwardly and rearwardly openingorifices that are exposed to the average velocity of the fluid flowingin the main, the said orifices occupying the same plane.

39. In an apparatus of the character described, the combination of aconductor pipe, a scale beam, a hollow member supported by said beam andcomprising connected parts, means whereby the weight of the contents ofone of said parts may be automatically forced into another part by achange of the flow through said conductor, a counterbalance weight onsaid beam, and means whereby said weight is automatically moved alongsaid beam to accurately counterbalance any change in weight of thecontents of said member.

40. In an apparatus of the character de scribed, the combination of aconductor pipe, a scale beam, a hollow member supported by said beam andcomprising connected parts, means for automatically discharging aportion of the contents of one of the parts into the other due to achange of the'flow through said conductor, acounterbalance weight onsaid beam, a motor, means whereby the position of said beam controls theaction of said motor, and means whereby the action of said motorcontrols the movement of said weight along said beam to accuratelycounterbalance any change in weight of. the contents of the supportedmember.

, 41., In an apparatus of the character described, the combination of aconductor pipe, siscale beam, a hollow member supported by said beam,means for automatically varying the .weight of the contents of saidmember ."by'a "change of the flow through said conductor, acounterbalance weight on said beam, a motor, means whereby the positionof-said beam controls the motor, and means whereby the motor controlsthe movement of the weight along the beam to accurately -;counterbalance any change in weight of the contents of the .supportedmember, and means cooperating-with said weight for showing the amount'offluid, which passes through said pipe.

42. In an apparatus of the character de- .scribe d -,;,.the combinationof a main supply pipe, a'scale beam, a receptacle supported by saidbeam, means for automatically varying .the weight of the contents ofsaid receptacle by a di erence betweenthe pressure at two points in saidpipe, a'counterbalance weight on said beam, means whereby saidcounterbalance is automatically moved along said beam a distancesuflicient to counterbalance each change in weight of the contents ofsaid receptacle, and means cooperating with said counterbalance forshowing the amount of fluid passing through said pipe.

scribed, the combination of a conductor pipe, a scale beam, two vesselscontaining liquid of greater specific gravity than the fluid to bemeasured, the same being supported by said beam, one on either side ofits balancing point, means of communication between flow through saidconductor will automatically change the relativeweights of the contentsof said vessels, ar -counterbalance, and means'for automaticallyadjusting the same to balance any such change in the relative weights ofthe contents of said vessels.

44. In an apparatus of the character described, the combination of aconductor pipe, a scale beam, two vessels containing liquid 43. In anapparatus of the character dcsaid: vessels, means 'whereby a change inthe I change in the relative Weights of t e contents of said vessels.

45. In an apparatus of the character described, the combination of aconductor pipe, a scale beam, two vessels containing liquid of greaterspecific gravity than the fluid to be measured, the same being supportedby said beam one on each side of its balancing point, a connectionbetween said vessels, means whereby a change in the flow through saidconductor will automatically change the relative weights of the contentsof said vessels, a counterbalance weight on said beam, amotor controlledb the osition of said beam whereby sai weig t is caused to be movedalong said beam to accurately compensate for any such change in therelative weights of the contents of said vessels, and means operated bysaid Wcounterbalancing means for showing the amount of fluid whichpasses through said pipe.

46. In-an apparatus of the character described, the combination of aconductor pipe a scale beam, two vessels containing liquid of greaterspecific avity than that to be measured supporte by said beam one oneither side of its "piuoting point, a connection between said vessels,means whereby a change in the flow through said pipe will automaticallychange the relative weights of the contents of said vessels, acounterweight, a motor controlled in its action by the position of saidbeam whereby said counterweight is caused to automatically compensatefor any such change in the relative weights of the contents of saidvessels.

47. In an apparatus of the character described, the combination of aconductor pipe, a scale beam, two vessels sup orted on said beam, one oneach side of its balancing point, a connection between said vessels,said vessels jointly containing a body of liquid of greater specificgravity than that of the fluid to be measured, means whereby thedifferential pressure in said pipe; of the fluid to 'be measured causesa proportional flow of said heavy liquidfrom one vessel to the other,and means for automatically com-- pensating for any change in therelative weights of the contents of said vessels.

48. In an apparatus of the character described, the combination of aconductor pipe, a scale beam, two vessels supported on said beam, one oneach side of its balancing point, a connection between said vessels,said vessels jointly containing a body of liquid of greaterspecific'grav ty than that of the fluid to be measured, means wherebythe differential pressure in said pipe of the fluid to be measuredcauses a proportional flow of said heavy liquid from one vessel to theother, means for automatically compensating for any change in therelative weights of the contents of the vessels whereby the beam may bebrou ht to a level position, and means operate by the counterbalancingmeans for shrwin the amount of fluid which passes throug the pipe. I

49. In an apparatus of the character described, the combination of aconductor pipe, a scale beam, two vessels containing liquid of greaterspecific gravity than the "fluid to be measured, the same beingsupported by said beam, one on either side of its pivoting point, aconnection between said vessels, means whereby a change in the flowthrough said conductors will automatically change the relative weightsof the contents of said vessels, a counterweight on said beam, meanswhereby said counterweight is automatically moved along said beam to accurately compensate for any such change in the relative weights of thecontents of said vessels, and means whereby the rate of flow asindicated by the position of said counterbalance on the scale beam isrecorded.

50. In an apparatus of the character described, the combination of aconductor pipe, a scale beam, two vessels supported on said beam, one oneach side of its balancing point, a connection between said vessels,said vessels jointly containing a body of liquid of greater specificgravity than that of the fluid to be measured, means whereby thedifferential pressure in said pipe of the fluid to be measured causes aproportional flow of said heavy liquid from one vessel to the other,a-flexible tube and means whereby the same is connected to' the upperportion of said vessel for conducting only the fluid to be measured, andmeans including'an adjustable counterweight for automaticallycompensating for any change in the relative Weights of the contents ofthe vessels 51; In a fluid meter, the combination of an agent responsiveto changes in the rate of flow of a fluid for causing a pressuredifference, a pivotally supported beam,a hollow member supported by thebeam, and containing a fluid heavier than that being metered, conduitmeans connecting the agent and the hollowmember to cause displacementofathe fluid in the member, a counterbalancing weight mounted on thebeam, a motor also mounted on the beam and connected to the weight formoving it with respect to the fulcrum of the beam, and a controller forthe motor, one part of which is stationary and the other responsive tomovements of the jected to the action of said fluid, a conduit beam.communicating with the first named ori- 52. A device for creatingdifferential presfices, and a second conduit communicating sure whichvaries with changes in the rate with the second orifice, both of saidconduits 16 of flow of a fluid in a supply main com risterminating atpoints outside of the main. ing means extending through a wall o the InWitness whereof I have hereunto set main and provided withsuitably-spaced orimy hand this 16th day of March, 1908. fices that aresubiected to the mean velocity AUSTIN R. DODGE. of the fluid flowinginsaid main and also Witnesses: with another orifice facing in adifferent di- BENJA HIN B. HULL, rection than the first named orificesand sub- HELEN ORFORD.

Beer AVAILABLE COPY j theh other responsive to movements of the I ficesthat are subjected to the mean velocity ofthe fluid flowing insaid mainand also with another orifice facing in a-difierent direction than thefirst namedorifices and sub- Correction in LettersPat'entNo. 1,087,930.

"[BE L] fication i'equiring correction as follows:

jected to the action of saidfluid, a conduit communicating with thefirst named orifices,-'and a second conduit communicating with thesecond orifice, both of said conduits 15.

,BENJAQ/IIN B. HULL,

HELEN, Onrol'm.

It is hereby certified that in LettersPutentNoQ1,087,930, gritntedFebi'uary 2%, 1914, upon the abplicetjon of Austin -R. 'Dodge,Schenectady-New York; for an 7 ,improv ement in Metersfor ElasticFluids, an error appearsiu the printed speci- Page 2, line 71 strik eout the wor '3 and;

and that the said Letters Patent should be read this'correetion' thereinthat the sarne m ay conform to the record of the casein thia Patent Office,

' i Sigued and sealed this-24th day of March; D'., 1 914;

3. T. N EWTbN Acting Commission er 0 f hten ts;

i 1 I I improvement in it is hereby certified that in Letters Patent No.1.087330, granted February 24,

1914, upon the ahplication of Austin it. Dodge, of Schenectady-New York;for an Meters for Elastic Fluids." an error appears in the printedspecification requiring correction as follows: Page 2, line 71, strikeout the word and and that the said Letters Pixtent should be read withthis correction therein that the same m ay oonform to the record of thecasein the Patent Ofiige.

Signed and sealed this 24th day of M h, A. 0., 1914.

.i. T. N EWTbN [SEAL] Acting C mmiasinner af Patents.

